1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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36 #ifndef _LIBCFS_BITMAP_H_
37 #define _LIBCFS_BITMAP_H_
42 unsigned long data[0];
45 #define CFS_BITMAP_SIZE(nbits) \
46 (((nbits/BITS_PER_LONG)+1)*sizeof(long)+sizeof(cfs_bitmap_t))
49 cfs_bitmap_t *CFS_ALLOCATE_BITMAP(int size)
53 OBD_ALLOC(ptr, CFS_BITMAP_SIZE(size));
62 #define CFS_FREE_BITMAP(ptr) OBD_FREE(ptr, CFS_BITMAP_SIZE(ptr->size))
65 void cfs_bitmap_set(cfs_bitmap_t *bitmap, int nbit)
67 cfs_set_bit(nbit, bitmap->data);
71 void cfs_bitmap_clear(cfs_bitmap_t *bitmap, int nbit)
73 cfs_test_and_clear_bit(nbit, bitmap->data);
77 int cfs_bitmap_check(cfs_bitmap_t *bitmap, int nbit)
79 return cfs_test_bit(nbit, bitmap->data);
83 int cfs_bitmap_test_and_clear(cfs_bitmap_t *bitmap, int nbit)
85 return cfs_test_and_clear_bit(nbit, bitmap->data);
88 /* return 0 is bitmap has none set bits */
90 int cfs_bitmap_check_empty(cfs_bitmap_t *bitmap)
92 return cfs_find_first_bit(bitmap->data, bitmap->size) == bitmap->size;
95 #define cfs_foreach_bit(bitmap, pos) \
96 for((pos)=cfs_find_first_bit((bitmap)->data, bitmap->size); \
97 (pos) < (bitmap)->size; \
98 (pos) = cfs_find_next_bit((bitmap)->data, (bitmap)->size, (pos)))